Watch List notes:

Severus Alexander, 222-235 Sestertius Rome circa 222-231, Æ 32.00 mm., 18.16 g.
Laureate bust r., with drapery on l. shoulder. Rev. The Emperor seated l. on platform; behind, officer and soldier and in front, Liberalitas with abacus standing l. Below, a citizen mounting steps. C 139. RIC 578.

Very rare, surface somewhat tooled, otherwise Very fine